Guru
Joined: 05/10/2019
Location: United KingdomPosts: 8884
| Posted: 03:09pm 30 Apr 2026 |
A very similar sort of thing, but this time using the PGA2350. I've retained most of the features and still kept the cost reasonably low and construction pretty easy, I think. There are few module options if you want PSRAM and built-in USB. The PGA2350 is probably one of the best but it does need a lot of soldering! By the time you take the connectors into consideration that's 128 soldered joints. :)
Major changes:
* PSRAM is present (enabled by GP47)
* The GPIO pins GP34-GP43 give a better range of possibilities including (unless used for something else) I2C2, both SPI, both COM and four ADC. (System I2C is on I2C0 - GP32/GP33)
* ESP8266-01S can optionally be fitted as the Pico 2 W isn't an option. It uses COM1 (GP44/GP45) and has its own supply regulator so isn't switched by the main mosfet. Instead, EN can be controlled by either GP46 or the 3V3 supply to enable it automatically.
* Option to use the larger RTC module with CR2032 and memory on it
* Bootsel available on the front, useful as a user input.
* The HDMI connector can now be upside down! It sounds silly, but you can now fit it as a plug-in module so it can be moved between boards. It makes it more recyclable. Having it upside down means that it will still fit in the S enclosure. OPTION HDMI PINS has to be changed, obviously.
There was no PCB width left for the LED, but it can still be fitted on flying leads and poked through the front panel above something else.
Once again, it's at a fairly advanced design stage and *should* work, if anyone's interested.